ML20235J191

Special Rept Spr 89-002:on 890202,Delta T 10-40 Meter Indications Inconsistent W/Actual Environ Conditions.Caused by Failure of 10-meter Aspirator Motor.Rotation Corrected to Move Air Flow Across Element to Aspirator Motor

ML20235J191
Person / Time
Site:	Summer
Issue date:	02/17/1989
From:	Bradham O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Ernst M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SPR-89-002, SPR-89-2, NUDOCS 8902240205
Download: ML20235J191 (2)

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[JM' South Carohna Elsetric & Gas Cornpany P o Box 88 ollis S.' Bradhtm -

Vice President

..-: .,~. . Jerwnsville. Sc 29065 Nuclear operations (803) 345-4040 SCE&G February 17, 1989 Mr. M. L'. Ernst Acting Regional Administrator U. S. Nuclear Regulatory Commission Region'II, Suite 2900 101 Marietta Street, N.W.

Atlanta, Georgia 30323

Subject:

Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Special Report (SPR 89-002)

Dear Mr. Ernst:

This Special Report is being submitted pursuant to the requirements of Technical Specification 3.3.3.4, " Meteorological Instrumentation." i During routine meteorological data review on February 2, 1989 (1230 hours0.0142 days <br />0.342 hours <br />0.00203 weeks <br />4.68015e-4 months <br />)',

it was observed that the Delta T 10-40 meter indications were not consistent with actual environmental conditions.

Investigation identified that the 10 meter aspirator mater had failed. A replacement was withdrawn from on-site spares, installed, and the unit returned to operable status February 3, 1989.

On February 6, 1989, the validity of the recorded data was questioned. On February 7, the 10-40 meter instrumentation was inspected and it was identified that the aspirator motor installed on February 3 was running opposite the desired direction (the unit is installed to establish air flow across the element to the motor eliminating the heat generated by the running motor). An investigation was initiated and it was found that the onsite spares show, by arrows, rotation opposite the desired direction.

Corrections were made to establish rotation such that air flow is across the '

element to the aspirator motor and the unit declared operable February 9, 1989 (1710 hours0.0198 days <br />0.475 hours <br />0.00283 weeks <br />6.50655e-4 months <br />).

The consequences of this event were minimal in that the Delta T 10-40 meter is used as a backup to the Delta T 10-61 meter which remained operable.

The remaining on-site spares have been tagged identifying the connection required for correct rotation.

Very truly yours, I

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.Mr. Malcolm L' Ernst.

' February 17, 1989 Page 2 .

c: D. A. Nauman/J. G. Connelly, Jr./0. W. Dixon, Jr./T. C. Nichols, Jr.

E. C. Roberts W. A. Williams, Jr.

General Managers J. J. Hayes, Jr.

-C. A. Price /R. M. Campbell, Jr.

R. B. Clary J. R. Proper K. E. Nodland J. C. Snelson G. O. Percival R. L. Prevatte

'J. B. Knotts, Jr.

Marsh & McLennan d)ocument Management: Branch INP0 Records Center ANI Library NSRC RTS (ON0 890009)

File (818.08 & 818.05))

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